The Republican senator was notified of the accident this afternoon while coming off stage after a rally with presidential candidate Mitt Romney.

Rubio spokesman Alex Conant writes in an email that 12-year-old Amanda, who is the senator's oldest daughter, "was a passenger on a golf cart involved in a collision in a private gated community." He says she was visiting with classmates. Conant adds that Amanda was airlifted to Miami Children's Hospital "with a head injury" and has been admitted to the Pediatric Intensive Care Unit.

Conant says "Senator and Mrs. Rubio are grateful for all the outpouring of support and prayers." He says that includes calls from President Barack Obama and Vice President Joe Biden and a personal message from Romney.

In a video posted on The Miami Herald's website, Miami-Dade County Commissioner Rebeca Sosa, a family friend, says Amanda had suffered a concussion but was doing better.

Sosa says the senator and his family were with Amanda at the hospital.

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